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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2a0e92f9063309e10bbe39d0575e570d0a82522f0b5891e9a2e7345d70703be0' 
  AND token = 'VkeKcLfQs8x3iiXDUlsjnupaG8fDQAGPXYCRLLBdie4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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