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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '76f057e086b55fe39e13bbe4ac251f36782dae790e10bbc59719f47f52f88ab3' 
  AND token = 'LDdBBCdiRR5n5Y69xrR3y07GXbiaKgeMRO5bcrW8EVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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