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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e70ea97a51e03000c3fcd81f9a658fa8c5d57d5ded5b495dc8d0fb9a2dab3e46' 
  AND token = 'ZAbLWhdjQ4u3fWGZhpRo61CtsPtfVs2k13VeObFkaA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}