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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12087637f38798018be185e0689ef7aa6894164e499e1e99c2187737daaa64fd' 
  AND token = '+Xq+JL3M4KqCsWyebi+jMIn76AV8GpI3sJ0wU5l+w0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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